To Increase the speed of your slow Android phone here is the guide to speed it up in 5 Minutes1. Close all your unused apps.Closing all the apps which you are not using saves a lot of memory usages which can be utilized by other apps to make it run faster.2. Clean all the app cacheDownload Clean Master software from the Playstore Clean Master

Press Junk Files and let it do its work After that press on Phone Boost option.3. Disable the Animations1.Go to "Settings"2. Then Go to "About phone"3.Tap on " Build Number" 7 times.4. Then Go back to settings and Tap on " Developer Option"5. Scroll Down to "Windows Animation Scale". as shown in the Image below6. Tap on "Animation Off".

No, memory card slot is not there in Mi A2. However, there is 64GB internal memory which is more than enough for use. You can have multiple games, photos, videos, apps and still there is space in your device. I am also using a 64GB phone and its been 2 months. Memory has never been an issue.